{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\toprule
            &\multicolumn{1}{c}{\shortstack{Cand. wins,\\t+1}}&\multicolumn{1}{c}{\shortstack{Cand. vote\\share, t+1}}&\multicolumn{1}{c}{\shortstack{Cand. qualif.,\\t+1}}&\multicolumn{1}{c}{\shortstack{Orient. nb. other \\cand.,t+1}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
            &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\midrule
Upper bound &       0.001         &       0.034\sym{**} &       0.087\sym{*}  &       0.071         \\
            &     (0.045)         &     (0.017)         &     (0.053)         &     (0.156)         \\
\addlinespace
Lower bound &      -0.016         &       0.009         &       0.028         &      -0.061         \\
            &     (0.042)         &     (0.011)         &     (0.056)         &     (0.120)         \\
\midrule
Bootstrap replications&          10         &          10         &          10         &          10         \\
Mean, left of threshold&       0.074         &       0.151         &       0.292         &       1.816         \\
\bottomrule
\end{tabular}
}
